import time
incomplete_sign = 50    # .的数量
print('='*23+'开始下载'+'='*25)
for i in range(incomplete_sign + 1):
    incompleted = "*" * i     #表示已完成
    incomplete = "." * (incomplete_sign - i)    #表示未完成
    percentage = (i / incomplete_sign) * 100   #百分比
    print("\r{:.0f}%[{}{}]".format(percentage,incompleted,incomplete),end="")
    time.sleep(0.5)
print("\n" + '=' * 23 + '下载完成' + '=' * 25)